NFL.com's Ian Rapoport reported Monday that outside linebacker Will Smith is expected to miss the 2013 season with a knee injury, according to a source who spoke with Smith. The injury happened Sunday against the Houston Texans.

ProFootballTalk first reported the news. Smith told ESPN's Ed Werder on Monday that the injury is a torn ACL and that Dr. James Andrews will perform the surgery.

Smith was attempting to make the transition from 4-3 defensive end to 3-4 outside linebacker in Ryan's new scheme. He led the team with six sacks last season. At 32, it's possible he's played his final down.

Ryan, meanwhile, must figure out a way to put pressure on the opposing quarterback without his top two pass rushers. Outside linebacker was a position of concern before the injuries. Now it looks like an outright liability.